Collapsible tap



V. R. KOONTZ.

COLLAPSIBLE TAP;

APPLICATION FILED Nov. I6, |918.

Patented sept. 14,1920.

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vIoToR n. KooNTz, oF wAYNEsBoRo, PENNSYLVANIA, AssIsNoR movieron, vToor,

. T all whom t may concern Y.'

COMPANY, or wAYNnsBoiao, 'PnNNsYLvANru ,A

VAN IA.

c'oLLAr'sIBLE TAP.

Be it known that I, Vieron-R. jKooNTz, a

citizen of the United States, residinglat` W'aynesboro, Franklin county, and State 'of' Pennsylvania, haveinvented and discovered certain new and useful Improvements in Collapsible Taps,` of vwhich the following is al speci'cation.

My said invention relates to improvements in taps .for cutting internal threads', and more particularly to collapsible taps of that class that are designed for cutting threads on the inside of pipes and the like.

The object of my said invention is to provide a tap of the character stated which,

`while having positive collapsible features,

is comparatively simple in its construction, light, durable, and easy to operate, all of which will be. hereinafter morevfully de-v scribed and claimed.

Referring to the accompanying drawings,

which are made a part hereof and on which similar reference charactersindicate similar parts: f Y

Figure 1 is a longitudinal section through a tap constructed in accordance with my said invention; v l

Fig. 2, a view of the inner end thereof; Fig. 3, a cross-section on the dottedvline L3*3 in Fig. 1; and

Fig. 4, a view thereof. v

In said drawings, like characters of referhowing the outer end Vence indicate similar parts in the several The main body portion 10 of the de-V views. vice is cylindrical in form and provided with radial slots 11 in one end for the reception of chasers or cutters 12. Said chasers are provided with cutting teeth 13 on their outer edges and their inner edges 14 are beveled or tapered. Grooves 15 are cut in one side of each chaser and are parallel with the beveled edge 14. A plunger 17 is mounted in a central bore with .which the several radial slots communicate. Said plunger is provided with a series of grooves 18 correspondingly beveled to the bevel portion 14 of the cutters and provided with fins 19 which fit snugly within the grooves 15. The plimger 17 is provided with a threaded opening 20 in which ts a threaded portion 21 of a size-adjusting screw 22 which is cylindrical in form and provided adjacent the portion 21 with a flange 23 for apur- Specification of Letters/Patent. f Patntedr" Sept. 14j .-Applicaibn niet November 16, i918. serial No. 262,835.

pose to be explained later.` Arlhe `body portion 10 is provided adjacent the bo're'l with an internal flange 24 vwhich separates `the bore 16 from asimilar 'bore 25 formed thereconroRArIoN on :PLNNsYIM in. A spring 26 is located'within the bore 25 and one end bears against ani'adju'stable nut 27 which is threaded 'on the. end of the screw 22 .while'its v'opposite end hea-rs against 'the Hang@ 24e' This Spring' `s-.under tension j to force the screw 22 together with theplun- 'f ger 17 outwardly, which, through the action of thebevelrportion of v'the plunger and chasers, withdrawsthe chasers. "Inorder to hold the chasers in their operative position, I have pIjOV'dedf` a latch28 vwhich is4 pivoted on a pin-29 in a slot 30 cut" in the b ody portion 10 andheldjiiritsflocked position by means of a'spring 31e'mbedded in sockets formed in the latch andin the lower side of the slotl30. A notch44l vis'form'ed in the end *of the latch 28 and ycooperates with the flange 23 of the size adjusting screw 22 to hold thevcutters out `in operative position.

Threaded on the, outside of the body portion 410, is a gagecollar 32 which-is split and provided with a locking/screw 33 to securely bind it to prevent its displacement.Y This collar isto limit the. distan'cr,v to which the thread-is to be cut. 1

The end of the body'portion adjacent the' cutters is closedby means'of `a member comprising a disk 34 secured thereby by screws 35. Projecting'from .this disk is a stem 36 supporting a head'37 which is cylindrical in form and used for the purpose of guiding Athe tool into the work to be threaded.

In order to lock the plunger in any par-lV p ticular position, a locking screw-38 is-provided which has one end 39 threaded into one end of the size adjusting screw22 and its opposite end projecting through the screw 22 and provided with a slot 40 for the reception of a screwV driver. Both the size adjusting screw and the nut are provided with slots 41 and 42 respectively, for

the reception of a wrench of suitable form.`

set-collar 32 limits the cutting, latch l28 is i released and spring 26 operates to collapse the die, when it may be withdrawn from the work, and reset, and the operation proceededwith vas be'ore.

- vHaving thus fully described my vsaid in# vention, what I claim as new and desire to secure by Letters Patent is:

l. A tap comprising a bodyV portion, chasers radiallymounted in the end or' said body portion, a plunger coacting with said tween said flange and said nut tocretract the said plungers, substantially as set forth.

2. A collapsible tap comprising, a body having an axial bore, chasers radiallymovable in and beyond'said body, a cam adapted` to vmove said chasers, aplunger, variable connection between the plunger and cam, a

s rin@ ada ted to act through the Jlunper 23 D :D

and cam toecontract the chasers, means to vary'the tension of the spring and means to latchthe spring against action.

3. A collapsible tap comprising, a body having an axial bore, chasers radially moviable in and beyond said body, a cam adapted to move vsaid chasers, a plunger, screwthreaded connection between the plunger and cam, a spring adapted to act through the plunger and cam to contract the chasers, means to vary thetension of the spring and means to latch the spring against action.

4. A collapsible tap comprising, a body having an axial bore, chasers radially movable in and beyond saidbody, cam adapted to move said chasers, a plunger, variable Vconnection between theplunger and cam,

means to lock the vvariable connection, a spring adapted to act through. the plunger 'and cam to'contracitfthe'ch'asers,"m`eaiis to vary the tension ofthe "spring'and "means to latch the spring against action. Y

5. A collapsible tap comprising, a body having an axial bore, chasers radially movable.

in and beyond said body, a cam-adapted to move said chasers,-a-plunger, screw threaded connection between the plunger and cam, means to facilitate the rotation ofthe pluni ger to. varythefconibined 'length of iplunger I and canna spring adapted toiactthrough theplunger, and* camtof contract the chasers,

means tofvary the tensionjol the spring .and

means to latch the spring against'action.

6. A collapsible tap comprising, =aV bb dyvr having an axial bore, chasers radiallyfmuav able in and beyond said'body, a camadapl'ted to 'move said-chasers, 'a plunger, fscrew threaded connection. between -the plunger and cam, a 'threaded lbolt extending 'axially through the ,z plunger and bearing against the cam, meansfto facilitate the rotationof'the plunger to Narythe. *combined length ol' plunger landv cam,"means ito v:facilitate the 4rotationof the-threadedbolt, a spring adapted t'oact'through the plunger-andcainto cntract thechasers,'meansto vary thextension of the spring, means to facilita-te themanipulation Ioit the spring tensioning am'ea'ns, all or said facilitating means ybeing uxt'aposed to theend offthe-plungerand means to latch. the spring against action.V In wltness whereoil have hereuntoset 80 my handv and sealat Waynesboro, Pennsylvania, this 6th day of November,-A. Dfnineteen hundred and geighteen. y VICTOR R. KOONTZ. [n sl] Witnesses:

lPEARL RIDENOUR, WATSON R.l DoRsoN. 

